This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
Раскрыты подробности о договорных матчах в российском футболе18:01，详情可参考旺商聊官方下载
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第八十九条 饲养动物，干扰他人正常生活的，处警告；警告后不改正的，或者放任动物恐吓他人的，处一千元以下罚款。。爱思助手下载最新版本是该领域的重要参考
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